Artificial tooth



' Feb. 23, 1932. F, s, TRU LER 1,846,286

ARTIFI CIAL TOOTH Filed Feb. 2, 1923 ii In venior By Attorney Patented Feb. 23, 1932 UNITED STATES PATENT ornce mu: 5. TRUSLER, or vnmou, Texas I ARTIFICIAL mourn Application filed Tebruary 2, 1929. Serial 336,968.

from shrinkage.

A further feature is the backing plate having an extension at one end laterally arranged to facilitate mounting on a bridge.

The predominating distinction is predicated upon the provision of an improved joint or coupling between the backing plate and facing, this embodying a cavity formed in the facing, and a coupling pin formed integrally on the backing plate for telescopic reception in the cavity, the pin having acute angular relationship with respect to the longitudinal axis of the backing plate to distribute strain and to prevent accidental shearing off of the pins from the direct biting pressure exerted upon it, when it is in use.

Other features and advantages of the invention willbecome more readily apparent from the following description and drawings.

In the drawings:

Figure 1 is a side or edge elevational view of a complete artificial tooth constructed in accordance with the present invention.

Figure 2 is a view in section and elevation showing the assemblage more precisely.

Figure 3 is a face view of the metallic backing plate and its coupling pin.

Figure 4 is a sectional view, taken approximately upon the plane of the line 4-4.- of Figure 2.

The entire tooth is generally designated by the reference character 5 and as before indicated, it comprises a suitably shaped porcelain casing 6, and a backing plate 7. These parts of course vary in configuration according to the particular point of placement in the mouth. The facin has au cx tension 8, functioning as a naturail gum shieid and appropriately shaped and colored torprovide a successful joint between the min" and the gum and to conceal the shrivelled portion of the gum. The facing is also; provided with an angularly disposed vertically elongated cavity, telescopically receivingthe correspondingly shaped and arranged coupling 'pin9 on the central portion of the backing plate. This pin is substantially ovate in cross section, as shown in Figures 3 and 4. Moreover, it is inclined with respect to the longitudinal axis of the'plate and fact assumesa sornewhat acute angular rota. tionship to the plate, The upper half portion is comparatively longer than. the lower half portion, thus giving the pin thesubstautially wedge shaped configuration observed in Figure 2. The advantage of this acuteangular relationship over a true right an ular relationship is to relieve the pin 0? shearing strain andto provide a more dependable and rigid joint. Thepin is also formed on opposite sidesWith longitudinallyformed toothed ribs 10, "functioning as keys and extending into key ways formed in the opposite side walls ofthe cavity in the facing as shown together, as shown in Figure 2, (cement, not shown), itis obvious that a wedge. like action is produced, firmly binding the" late and facing together and equalizing t e strain and thus-rendering the joint more steady and dependable in action.

Atone end of the backing. plate is a lateral extension 11, for connection with bridgework and at the opposite endis a laterally offset thickened biting edge 12.

A careful consideration of the description in. conjunction with the drawings will convincingly show the reader that I have evolved and produced a structure which, it is believed, will supersede similar artificial tooth constructions and a structure which, it is believed, has been previously unequalled in the art or the trade, something which is practical and modern and will fulfill the requirements of an invention of this class in a highly satisfactory manner.

In Figure 4. When the partsare connected ing plate having a connecting pin fitting'conformably wlthln said cavity, said connecting A more specific description of the invention is regarded unnecessary. 7

Minor changes in the size, shape and materials coming within the field of invention may be resorted to, in actual practice, if desired.

I claim p 1. Inan artificial tooth construction class'described, a facing having a longitudinally elongated cavity extending inwardly and inclined downwardly from onefside of the facing, and a backing plate disposed in contact with said facing at said oneside-and having a correspondingly shaped coupling pin fitted into said cavity,'said coupling pin being disposed at an acute angle to the l0n--- gitudinal axis of the backing plate, and a plurality of longitudinally spaced downwardly and forwardly extending toothed ribs formed on the opposite longitudinal sides of said pin and keyways formed in the opposite longitudinal sides of the cavity for receiving said ribs.

p 2. As a new productoof manufacture, a backing plate having one end thickened and laterally offset to provide a biting surface and having the opposite end laterally dis- 1 posed to facilitate connection with bridge work,,said plate on one side thereof being provided with an elongated coupling pin having on'opposite longitudinal sides thereof a plurality of longitudinally spacedinclined toothed. anchoring ribs; p v

3. Inan artificial tooth of'the class described, a facing having a cavity, and a backpin embodyinga relatively long upper edge inclining downwardly and outwardly from said backing plate and at its outeriend merging into a downwardly and inwardly inclined vertical edge which in turn at its lower end merges into the lowermost end of the lower edge of said pin, said lower edge inclining downwardly from said plate and being of a length shorter than the upper edge of said pin, and a plurality of longitudinally extending vertically spaced anchoringri-bs on opposite vertical sides of said pin inclining down:

wardl y and outwardly toward the outer inclined edge of said pin. v I

In testimony whereof I affix my signature.

S. TRUSLER."

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